Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cbbe0513eaa180…

MALICIOUS

PDF

98.4 KB Created: 2021-06-26 23:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 082282a5bc4e3f09ba8e1f9e9aa7e224 SHA-1: 9650e11407a126843e9f705b887a2e926cf46e30 SHA-256: f0cbbe0513eaa180a2ae6ffbd2e72557d1203936c777d85356da01f550f4ecb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of numerous links on potentially compromised domains suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://italvaping.com/file/5072588524.pdf In PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/lazudepikuxudopugorefi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d3e78b1f---lubeliremop.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1c2cb59ad---letuvutenanufezos.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2c0fbf1137d62dad459c849b6f696de4/35458684057.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/15928df2d2d8d585a8efa01d4419b585/bekulotup.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eac04e00b---mowuk.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/57639112630.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g0phof627ejve46qoki3g22d24/vonaxajaw.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/jimorudakadokelakok.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zukapitosazolovurij.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/roxotenaxunewizesemosadab.pdfIn PDF document text
    • http://soupworld.de/upload/file/tobipukivatiru.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/kiburewoferixudubo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702a1667116---11886962568.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/67276470208.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210609205858.pdfIn PDF document text
    • http://esistore.be/userfiles/file/91719252541.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xokikuxuvozasabudofilap.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c62ad4d167865c8b0b16a069f518282a/70923543420.pdfIn PDF document text
    • https://ubranni.com/uploader/files/tipitaminosak.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/986fec11cd2aae6bb8ff709cc3b23d87/85008641847.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/04ed745f2e165ab5109e950ebbfd82d5/2282817556.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab344275fb---38998652916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nih+stroke+scale+certification+a+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 10588 bytes
SHA-256: 494817dfe2553c1f59adaa67d4f7652ef81a59f99f574d7daaed50db7709a7dd
font_02_sfnt_off00014eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB9 17252 bytes
SHA-256: 352a9df22de49d5b975a0c9441da67305f7e00a0d72d27c488d30662e9dde245

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